package com.atguigu.gulimall.product.service.impl;

import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity>
        implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page =
                this.page(new Query<CategoryEntity>().getPage(params), new QueryWrapper<CategoryEntity>());

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTrre() {
        // 查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        List<CategoryEntity> leve1Menus =
                entities.stream()
                        .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                        .map(
                                (menu) -> {
                                    menu.setChildren(getChildrens(menu, entities));
                                    return menu;
                                })
                        .sorted(
                                (menu1, menu2) -> {
                                    return (menu1.getSort() == null ? 0 : menu1.getSort())
                                            - (menu2.getSort() == null ? 0 : menu2.getSort());
                                })
                        .collect(Collectors.toList());
        return leve1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查删除的是否被其他地方应用
        baseMapper.deleteBatchIds(asList);
    }

    // 递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity entity, List<CategoryEntity> all) {
        List<CategoryEntity> children =
                all.stream()
                        .filter(
                                categoryEntity -> {
                                    return categoryEntity.getParentCid() == entity.getCatId();
                                })
                        .map(
                                categoryEntity -> {
                                    // 找到子菜单
                                    categoryEntity.setChildren(getChildrens(categoryEntity, all));
                                    return categoryEntity;
                                })
                        .sorted(
                                (menu1, menu2) -> {
                                    // 菜单的排序
                                    return (menu1.getSort() == null ? 0 : menu1.getSort())
                                            - (menu2.getSort() == null ? 0 : menu2.getSort());
                                })
                        .collect(Collectors.toList());
        return children;
    }
}
